Road Bike, Cycling Forums banner

1 - 20 of 27 Posts

·
Registered
Joined
·
110 Posts
Discussion Starter · #1 · (Edited)
After wrecking my bike frame due to an accident. I am looking for a new frame. Narrowed down to Cervelo S1 2010, Felt F5SL and Kestrel Talon SL 2010 with my budget of around US$1200.

Also in the budget range are Fuji SST 2.0 and Excalibur 2009.

I do alot of criteriums and sometimes short courses triathlons. I

Does the weight difference of Felt F5SL outweight the aero factor the S1 brings, sometimes i just find that the aero factor of the soloist are kinda over-rated. Maybe it has a higher power transfer ratio compared to the rest, i am not really sure of that too. But it is indeed a winning machine in both road and triathlon world. However it is also quite old too, an 2001 design. Got a feeling that they might revamp the S models in next year, thereby reducing the resale value if i were to sell it.

Maybe someone can give me advice on the bikes, never rode any of them before. Welcome to new frames suggestion as well.
 

·
wasssabi
Joined
·
2,081 Posts
The aero factor of all frames is overated.
I read some numbers by a leading expert in the field and the frame made the least difference. Aero shoe covers are a lot cheaper and make a bigger diff.
I'd rather have a stiffer frame.
 

·
Sucker for carbon
Joined
·
266 Posts
T K said:
The aero factor of all frames is overated.
I read some numbers by a leading expert in the field and the frame made the least difference. Aero shoe covers are a lot cheaper and make a bigger diff.
I'd rather have a stiffer frame.
+1 on this. Unfortunately an aero frame can only do so much to help out the inherently poor aerodynamics of the human body.
 

·
Registered
Joined
·
110 Posts
Discussion Starter · #4 ·
Any suggestions? I've heard S1 has one of the better power transfer from the legs to the bike.
 

·
Registered
Joined
·
9 Posts
I had a Soloist Team (same as S1) frameset. I regret selling it. It was the most responsive feeling frameset to hard inputs I ever rode. I don't know the data on comparative response in framesets including the S1... I don't know how they would be able to quantify it. All I know is I could feel more "jump" when sprinting or hammering a climb with this frameset more than any frameset I ever rode. I have a CAAD 9 which is a great frameset too... very responsive and solid but the Cervelo S1/Soloist Team feels like it has more "jump".
 

·
Registered
Joined
·
479 Posts
I have one old s1, nice frame, stiff at bb.nice power transfer I use it for some races and some training. has about 50000 klm.
 

·
Registered
Joined
·
3,364 Posts
T K said:
The aero factor of all frames is overated.
I read some numbers by a leading expert in the field and the frame made the least difference. Aero shoe covers are a lot cheaper and make a bigger diff.
I'd rather have a stiffer frame.
Since I don't know how you rate the aero factor, I can't tell whether it's over- or under- rated. I do know that switching from a standard to an aero frame can lower the drag of the bike+rider by about 10%. This is comparable to what a good set of aero wheels will do and much greater than shoe covers (cf. Cobb and Martin in High-Performance Cycling).

On the other hand, all parasitic losses in the bike amount to only about 2% which in addition to frame flex includes drag in the bottom bracket, jockey wheels, pedals, and the overwhelming contributor, the chain. But even ignoring all those contributions, the 10% reduction from the aero frame is significantly greater than the 2% maximum that could be going to frame flex.
 

·
Registered
Joined
·
2,078 Posts
asgelle said:
I do know that switching from a standard to an aero frame can lower the drag of the bike+rider by about 10%.
Drink the Kool Aid much?

They presented hypothetical data from mathematical calculations and based it on shapes that are not UCI legal so are not comparable to current frames on the market.
 

·
Registered
Joined
·
3,364 Posts
ewitz said:
Drink the Kool Aid much?

They presented hypothetical data from mathematical calculations and based it on shapes that are not UCI legal so are not comparable to current frames on the market.
That's not the only source for that number (just the one that popped into my head). It's been shown through repeated testing, both wind tunnel and field to be the consistently observed value. I also recall Cobb and Martin did field testing as well.
 

·
Registered
Joined
·
420 Posts
If it were me, I'd bag the aero hunt and pick up a Cannondale caad 9. With the caad 10's just coming out, you should be able to get a good deal on one, and it will be WAY less than the cervelo. Killer frame, great for crits. Use the money you saved to get some other aero gear for your tri's, namely good wheels, helmet, etc.
 

·
Registered
Joined
·
3,364 Posts
ewitz said:
They presented hypothetical data from mathematical calculations and based it on shapes that are not UCI legal so are not comparable to current frames on the market.
As I thought, the data are from actual wind tunnel testing on frames which are still available for sale today (with perhaps some updates) and are certified UCI legal.
 

·
Registered
Joined
·
479 Posts
I dont know if aero really works. I know that I had porbs on really really strong winds. sudden hard cross gusts have made me get some scares
 

·
wasssabi
Joined
·
2,081 Posts
asgelle said:
Since I don't know how you rate the aero factor, I can't tell whether it's over- or under- rated. I do know that switching from a standard to an aero frame can lower the drag of the bike+rider by about 10%. This is comparable to what a good set of aero wheels will do and much greater than shoe covers (cf. Cobb and Martin in High-Performance Cycling).

On the other hand, all parasitic losses in the bike amount to only about 2% which in addition to frame flex includes drag in the bottom bracket, jockey wheels, pedals, and the overwhelming contributor, the chain. But even ignoring all those contributions, the 10% reduction from the aero frame is significantly greater than the 2% maximum that could be going to frame flex.
No freakin way!
If there is a 10% reduction I would believe that is from one frame to the next and not in overall savings. And I doubt the frame itself is even 10% of total drag. So if I switched to an aero frame, instead of going 20 mph would I be going 22 mph? That 10 percent is probobly less than 1% in the total number.
Len Brownlie, Ph.D says in a 40k ITT an aero frame compared to a non aero frame will save you 17 seconds. Aero shoe covers will save you 30.
In a crit, unless you are on some mad solo breakaway, hardly makes a diff. I'd rather have a stiff bike for the final sprint.
To the OP, I think the Cervelo would make a great crit bike.
If I was to do it over again, I would seriously be looking at the Van Dessel Hella Faster. I do love my Caad 9 though.
 

·
Registered
Joined
·
3,364 Posts
T K said:
No freakin way!
If there is a 10% reduction I would believe that is from one frame to the next and not in overall savings. And I doubt the frame itself is even 10% of total drag. So if I switched to an aero frame, instead of going 20 mph would I be going 22 mph?
All I can say is read the chapter. Cobb and Martin present it much better than I could. But I would also politely suggest that if you think a 10% reduction in drag results in a 10% increase in speed, you have a lot of reading to do on the physics of bicycles.
 

·
wasssabi
Joined
·
2,081 Posts
No, I don't think that. I was just throwing that out there, trying to say that I don't think there will be much of a difference to the average guy out on the crit course.
 

·
Adventure Seeker
Joined
·
5,115 Posts
Get the 2009 SL01 from competitive cyclist. $699 won't hurt as bad when you wreck it in a crit. It's also a very nice frame, super stiff bottom bracket for acceleration, but not overly harsh in a ride. I'm very happy with mine.
 

·
Registered
Joined
·
465 Posts
heffergm said:
If you're looking at the S1 take a peek at the Neuvation F100. Not sure if he still sells framesets but worth asking.

Do you know how the two compare? I've considered an F100 or FC100 with full red of force for crits mainly.
 
1 - 20 of 27 Posts
Top